Note 16 - Subsequent Events (Details Textual) - Subsequent Event [Member] - William Bartels [Member]	Jan. 18, 2020 USD ($)
Five Yer Period Agreement, Retirement Compensation	$ 100,000
Five Year Period Agreement, Annual Regular Fees	55,000
Five Year Period Agreement, Annual Supplemental Fees	50,000
Five Year Period Agreement, Annual Medical Benefits	15,588
Five Year Period Agreement, Annual Compensation	220,558
Five Year Period Agreement, Total Compensation	$ 1,102,940
SPAR Group [Member]
Related Party Ownership Percentage	25.10%

The total compensation including all benefits to be paid per year under the five year period agreement.

No definition available.

Name:	sgrp_FiveYearPeriodAgreementAnnualCompensation
Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The annual medical benefits to be paid per year under the five year period agreement.

No definition available.

Name:	sgrp_FiveYearPeriodAgreementAnnualMedicalBenefits
Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of regular fees per year to be paid under five year period agreement.

No definition available.

Name:	sgrp_FiveYearPeriodAgreementAnnualRegularFees
Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of supplemental fees to be paid per year under five year period agreement.

No definition available.

Name:	sgrp_FiveYearPeriodAgreementAnnualSupplementalFees
Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The total compensation to be paid under the five year period agreement.

No definition available.

Name:	sgrp_FiveYearPeriodAgreementTotalCompensation
Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of retirement compensation under the five year period agreement.

No definition available.

Name:	sgrp_FiveYerPeriodAgreementRetirementCompensation
Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Percentage of ownership by a related person in a related entity.

No definition available.

Name:	sgrp_RelatedPartyOwnershipPercentage
Namespace Prefix:	sgrp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sgrp_WilliamBartelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_OwnershipAxis=sgrp_SparGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: